v8/test/mjsunit/keyed-call-ic.js

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// A test for keyed call ICs.

var toStringName = 'toString';
var global = this;

function globalFunction1() {
  return 'function1';
}

function globalFunction2() {
  return 'function2';
}

assertEquals("[object global]", this[toStringName]());
assertEquals("[object global]", global[toStringName]());

function testGlobals() {
  assertEquals("[object global]", this[toStringName]());
  assertEquals("[object global]", global[toStringName]());
}

testGlobals();


function F() {}

F.prototype.one = function() {return 'one'; }
F.prototype.two = function() {return 'two'; }
F.prototype.three = function() {return 'three'; }

var keys =
    ['one', 'one', 'one',  'one', 'two', 'two', 'one', 'three', 'one', 'two'];

function testKeyTransitions() {
  var i, key, result, message;

  var f = new F();

  // Custom call generators
  var array = [];
  for (i = 0; i != 10; i++) {
    key = (i < 8) ? 'push' : 'pop';
    array[key](i);
  }

  assertEquals(6, array.length);
  for (i = 0; i != array.length; i++) {
    assertEquals(i, array[i]);
  }

  for (i = 0; i != 10; i++) {
    key = (i < 3) ? 'pop' : 'push';
    array[key](i);
  }

  assertEquals(10, array.length);
  for (i = 0; i != array.length; i++) {
    assertEquals(i, array[i]);
  }

  var string = 'ABCDEFGHIJ';
  for (i = 0; i != 10; i++) {
    key = ((i < 5) ? 'charAt' : 'charCodeAt');
    result = string[key](i);
    message = '\'' + string + '\'[\'' + key + '\'](' + i + ')';
    if (i < 5) {
      assertEquals(string.charAt(i), result, message);
    } else {
      assertEquals(string.charCodeAt(i), result, message);
    }
  }

  for (i = 0; i != 10; i++) {
    key = ((i < 5) ? 'charCodeAt' : 'charAt');
    result = string[key](i);
    message = '\'' + string + '\'[\'' + key + '\'](' + i + ')';
    if (i < 5) {
      assertEquals(string.charCodeAt(i), result, message);
    } else {
      assertEquals(string.charAt(i), result, message);
    }
  }

  // Function is a constant property
  key = 'one';
  for (i = 0; i != 10; i++) {
    assertEquals(key, f[key]());
    if (i == 5) {
      key = 'two';  // the name change should case a miss
    }
  }

  // Function is a fast property
  f.field = function() { return 'field'; }
  key = 'field';
  for (i = 0; i != 10; i++) {
    assertEquals(key, f[key]());
    if (i == 5) {
      key = 'two';  // the name change should case a miss
    }
  }

  // Calling on slow case object
  f.prop = 0;
  delete f.prop; // force the object to the slow case
  f.four = function() { return 'four'; }
  f.five = function() { return 'five'; }

  key = 'four';
  for (i = 0; i != 10; i++) {
    assertEquals(key, f[key]());
    if (i == 5) {
      key = 'five';
    }
  }

  // Calling on global object
  key = 'globalFunction1';
  var expect = 'function1';
  for (i = 0; i != 10; i++) {
    assertEquals(expect, global[key]());
    if (i == 5) {
      key = 'globalFunction2';
      expect = 'function2';
    }
  }
}

testKeyTransitions();

function testTypeTransitions() {
  var f = new F();
  var s = '';
  var m = 'one';
  var i;

  s = '';
  for (i = 0; i != 10; i++) {
    if (i == 5)  { F.prototype.one = function() { return '1'; } }
    s += f[m]();
  }
  assertEquals("oneoneoneoneone11111", s);

  s = '';
  for (i = 0; i != 10; i++) {
    if (i == 5)  { f.__proto__ = { one: function() { return 'I'; } } }
    s += f[m]();
  }
  assertEquals("11111IIIII", s);

  s = '';
  for (i = 0; i != 10; i++) {
    if (i == 5)  { f.one = function() { return 'ONE'; } }
    s += f[m]();
  }
  assertEquals("IIIIIONEONEONEONEONE", s);

  m = 'toString';

  s = '';
  var obj = { toString: function() { return '2'; } };
  for (i = 0; i != 10; i++) {
    if (i == 5)  { obj = "TWO"; }
    s += obj[m]();
  }
  assertEquals("22222TWOTWOTWOTWOTWO", s);

  s = '';
  obj = { toString: function() { return 'ONE'; } };
  m = 'toString';
  for (i = 0; i != 10; i++) {
    if (i == 5)  { obj = 1; }
    s += obj[m]();
  }
  assertEquals("ONEONEONEONEONE11111", s);
}

testTypeTransitions();